20643002 has 8 divisors (see below), whose sum is σ = 30984096. Its totient is φ = 10314972.

The previous prime is 20642971. The next prime is 20643043. The reversal of 20643002 is 20034602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20643002² = 852267063144008, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (3873012).

Almost surely, 2^20643002 is an apocalyptic number.

20643002 is a deficient number, since it is larger than the sum of its proper divisors (10341094).

20643002 is a wasteful number, since it uses less digits than its factorization.

20643002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20643002 is about 4543.4570538303. The cubic root of 20643002 is about 274.3200922880.

Adding to 20643002 its reverse (20034602), we get a palindrome (40677604).

Subtracting from 20643002 its reverse (20034602), we obtain a square (608400 = 780²).

The spelling of 20643002 in words is "twenty million, six hundred forty-three thousand, two".